Show the tree's file names without the .geojson suffix

The suffix ("ride.gpx" -> "ride.gpx.geojson" once cached) explained
what the name would download back when it doubled as a GeoJSON-only
download link. Now that downloading is the download button's job
(previous commit), it was just confusing -- the file itself is still
named "ride.gpx".

public/js/gpx.js

@@ -296,20 +296,16 @@ export class GpxPanelControl {
     checkbox.type = "checkbox";
     checkbox.checked = this._visible.has(file.path);
     checkbox.addEventListener("change", () => this._toggleFile(file.path, checkbox.checked, checkbox));
-    // Once a .gpx/.fit is cached, its converted GeoJSON is the thing that's
-    // actually shown on the map from here on (see GpxStore#geojson) — the
-    // name reflects that (matching the real "<path>.geojson" cache file on
-    // disk) rather than still reading as a plain, un-converted .gpx/.fit.
-    // A direct .geojson upload already ends in .geojson, so it's left
-    // alone. Plain text, not a link — downloading is the download button's
-    // job now (see below), one obvious place instead of two differently-
-    // shaped ones (the name used to double as a GeoJSON-only download
-    // link, easy to miss and only half the story).
-    const displayName = file.cached && !file.name.toLowerCase().endsWith(".geojson") ? `${file.name}.geojson` : file.name;
+    // Just the real, as-uploaded name — it used to grow a ".geojson" suffix
+    // once cached (matching the real "<path>.geojson" cache file on disk),
+    // back when the name doubled as a GeoJSON-only download link and the
+    // suffix explained what clicking it would get you. Now that downloading
+    // is the download button's job (see below), that suffix was just
+    // confusing: the file is still named "ride.gpx", not "ride.gpx.geojson".
     const loggedIn = isLoggedIn();
     const name = document.createElement("span");
     name.className = "gpx-tree__file-name";
-    name.textContent = displayName;
+    name.textContent = file.name;
     label.appendChild(checkbox);
     (file.kinds || []).forEach((kind) => label.appendChild(this._kindIcon(kind)));
     if (!file.cached) label.appendChild(this._pendingIcon());